[TeMPOraL]

GP may be more up to date, but from I remember from previous decade, cloning blood would be no-go, and so your own blood that was stored outside of your body. Cardiopulmonary bypass was AFAIR considered OK, because it's considered to be just an extension of body's blood flow.

[JoelMcCracken]

Things have not changed much. Cardiopulmonary bypass is considered OK, as well as other devices that might be considered as extensions. An individual might still choose to not accept such treatment.